Oscillation-generator.



L. DE FOREST.

OSCILLATION GENERATOR.

APPLICATION mm 0:0.28. ms.

Patented Oct. 17, 1916.

W7 W 5 III I P .fl

LEE: FOREST, OF NEW YORK, N. Y., ASSIGNOR '10 DE FOREST RADTO TELEPHONE AND TELEGRAPH COMPANY, OF'NEW YORK, N. Y., A COBIOEA'IION OE DELAWARE.

OSOILLATION-GTOB.

emme.

Specification of Letters Patent.

Patented on. 17, 1916.

Original application filed Kay 13, 1915, Serial No. 27,771. Divided and this application Med December 88,

- 1815. Serial no. 88,987.

To all whom it may concern:

Be it known that L'Lnn on Fonns'r, a citizen of the United States, residing at New York city, county of Bronx, State of New ,York, have made a certain new and useful Invention in Oscillation-Generators, of which the following is aspecification.

This invention relates to generators of oscillating, or pulsating currents and embodies subject matter divided from my application Serial No. 27,771, filed May 13, 1 15'.

The object of the invention is to provide a generator of oscillating, alternating or pulsating electric currents which is simple and efiicient.

I -A further object is to provide an oscillation generator of the character referred to capable of generating oscillating, alternating or pulsating electric currents of substantially uniform amplitude.

Other objects of the invention will appear more fully hereinafter;

The invention consists substantially in the construction, combination, location and relative arrangement of parts, all as will be more fully hereinafterset forth, as shown in the accompanying drawing and finally pointed out in the appended claims.

- Referring to the drawing: Figure 1 is a circuit diagram showing an arrangement of .generator of continuous, oscillating, alternating or pulsating currents embodying my invention. Fig. 2 is a similar view showing a modified arrangement of oscillating generator embodying my invention as applied for use in connection with radio systems.

In'carrying out my inventionI employ a closed and preferably, evacuated vessel or bulb in which are located cold and hot electrodes, and I provide suitable circuit connections and current supply source to said electrodes, and where the. generator is employed in connection with radio systems associate the generator with a suitable radiating system having means connected thereto or associated therewith for altering or modifying theradiations from the system either manually, as through a tele aph key, or otherwise, as for instance, a te ephone transmitter, in accordance with signal code or sound waves.

Referring to Fig. ,1, U designates the evacuated vessel or bulb. Located within this vessel or bulb is a hot electrode F, which,

in the form shown, is a filament and also:

located within the evacuated vessel U are the cold electrodes 9 and W. To the filament or glower electrode F current is supplied from any convenient source as indicated at A, which source may be a battery or a direct current generator. Where an alternating @urrent generator is employed the frequency thereof for wireless telephone operation,

should be above that of the essential freequencies of voice sounds, say for instance,

fifteen hundred cycles per second, or higher. For wireless telegraphwork the frequency of the generator may be very much lower, say, for example, five hundred cycles per second. v

In the particular form shown but to which my invention is not to be limited or restricted, I employ two cold electrodes W in the.

form of plates or wings," and one cold electrode g in the form of a grid and I have shown the grid electrode g positioned between the hot electrode F and one of the cold plate or wing elements W. A circuit has one of its terminals connected to the cold grid'electrode W. This connection including a source of current B toan inductance coil D. This circuit connection of electrodes g and W is also connected to one side or terminal of hot electrode F. The other cold plate or wing electrode W is shown connected to the other side or terminal of the hot electrode F. If desired, the circuit con- *nection with each other and nected to the cold plate or wing electrodes antenna earth sy evacua once within said vl oi the hot or lower said circuit is an in uctance coil P, which I lil'. derstood lnthe-art.

egra hie c'o W. and the negative side to one term ofthe hot ,elec'tre F. In this instance the circuit connection between the cold id elecand the cold plate or wmg elecincludes a blocg condenser, indicated at (1,, Connected across this circuit is a variable capacit C and included in constitutes, in the form shown, member in association with a coil 4 in: N, E, the 0011i]. iing preferably aloose oupling. apparatus is to be used for telephon t P poses the ante has associated therewith or includes therein a microphone transmitter M. are the apparatus is to be used for ph ey K is bridlgfl across a portion of i inductance S. f desired the grid and plate circuit may he inductively'associated with the plate and h i went circuit through inductance L, as shown. It is obvious that the current supply to the hot electrode F, or to the circuit connection of cold plate or w electrodes W, may be controlled in any suitable or convenient in 141;; as, for instance, by the adjustable resistance lit.

y reason of the arrangements above descrihed and the ionizing of: the, gas in the or bulb U due to the pres- -.electrode F, and by impressing an e ectroelectrode motive force within the space between the cold plate or win electrodes W and the hot from the current source B, the device U, with its electrodes and their a Tciated circuits and circuit connections as dei ,sc'rimd becomes a neratorot oscillag,

' which are imp connects the grid and plate electrodes, the

Ialternating or pulsating electric currents upon the circuit wch on; ct which depends upon the con- .dih'o'n o the gas within the c U, the spatial relation of the elrode member contain therein, the value of the-electro-motive force impressed acr the electrodes, "and" the amount of inductance and capacity in or 1 with the circuit coection between the cold electrodes. This frequency be varied by adjust the capacity or array in uctance in said circuit connection.

-'., By reasoned the association ot'the t ereto la circuit connec the cold. electrodes with the antenna earth N, E the oscillating, alternating or plsating currents in id circuit connection are imressed upon sired the amplitude of the oscillations in-.

out in the-antenna earth system may be varied b p and in accordance with sound wavesfa lin upon the microphone. transmitter M in '1 usual mer. It is obvious that the wave length of the tted wave trains may be altered in a manner well unpower to adect momenty ihe conduc-.

tivity of the surroung or inter-connectmg gas medium within the I l in such manner that the action, when set up, is salt perpetuating.

From the ioregor description it he observed that in. its road seem my invention lies in the discovery that when suitably I connected and associated an audion becomes a enerator of illag, rating, or pusatin electric. curts which may, be utilized to rents are desi and l have succeeded in securing remarkahle' results in e practical use and operation of an oscillation generator of this character particularly when applied to t generator of high fuency lat ons It is obvious that the rin'ciples of my invention may be ernbo ied in various an rangements and circuit connections-without departure from the spirit and scope of my invention as defin m the bu Having now set forth the objects and nature of m invention and circuit urgements em odylng the rinciples thereof, what I claim as new an r and of my own invention, and desire tosecure by Letters Patent, is-

r anurpose for wch-ch can,

lllO

1. The combination with evacuated 126 vessel, of a pluralityot elements, a

plurality of grid elements, and a hot elecrend a hot electrode, a grid electrode bein 10" trode arranged therein, a grid element being interposed between each wingelectrode an arranged between each wing element and the hot electrode. I

2. An audion having a plurality of grid electrodes, a plurality of wing electrodes,

and a hot electrode.

3. An audion having a. plurality of grid electrodes, a plurality of vwing electrodes,

m witnesses, on this 21st day of December, 15 A. D., 1915.- e

the hot electrode.

In testimony whereof I have hereunto set hand'in the presence of the subscribing LEE on FOREST. 

